Hydroxyapatite derived from food-grade duck bones was used as a bio-sorbent to remove a textile dye from aqueous effluents. Dissolution of the bone minerals at acidic pH values and co-precipitation in the dye effluent at neutral pH values effectively eliminated the color from the solution of disperse red 167. Infrared spectroscopy and thermal analysis of the precipitates confirmed that more than 50% of the weight was composed of organic matter. The amount of hydroxyapatite to be used was determined as a function of the initial dye concentration. One g. of HA can absorb as much as 1.4 g of dye. The use of this bio-sorbent is considered to be a valuable low-cost material for wastewater treatment.